HiHELIOS project aims to develop a scalable, modular and safe Hybrid Energy Storage System (HESS), designed to meet the evolving needs of energy grids and electric mobility. Combining high-power storage from lithium iron phosphate (LFP) batteries or supercapacitors with high-energy capabilities from second-life nickel manganese cobalt (NMC) batteries, HiHELIOS brings together advanced battery technologies with digital intelligence. Leveraging and adapting innovations from the SEABAT project, the system is tailored for grid-scale applications and EV charging support. ​